No. 8 Group RAF-- Part 2: Using Oboe, Gee and H2S

It was a key component of the Bomber Command.  It consisted of specialist squadrons that marked targets for the main targets of Bomber Command aircraft.

The Force, which had been formed in August 1943 with five squadrons flying a mix of Short Stirlings, Handley Page Halifaxes, Avro Lancasters and Vickers Wellingtons.

Whenever new improved aircraft became available, like the de Havilland Mosquito,  8 Group got the first ones.  Its aircraft used  advanced navigation aids like Gee, H2S and Oboe to find targets of attack more accurately than the main force of bombers could do on their own by eye.

--GreGen